Zinc bed for printing purposes.



No 37,920. 7 Patented Nov. 2 I899.

H. BURLICH as. WALZEL.

ZINC BED FOR PRINTING PURPOSES.

(Application filed Feb 7. 1899.) (No Model.)

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UNITED STATES PATENT @FFICE.

HENRY BURLIOH AND GREGOR WALZEL, OF NEW YORK, N. Y.

ZINC BED FOR PRlNTl-N G PURPOSES.

srEcIFIoATxoN forming part of Letters Patent No. 637,920, dated November as, 1899. Application filed February '7, 1899. Serial No. 704,866. (No model.)

To ctZZ whom it may concern: I

Be it known that we, HENRY BURLICH and GREGOR WALZEL, citizens of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Zinc Beds; and we do hereby declare the following to be a clear and exact description of the invention, reference being had to the accompanying drawings, which form part of this specification.

Our invention relates more particularly to zinc beds which are used in lithographic-printing machines, and has for its object to provide novel and simple means to stretch a sheet-zinc over the bed in a perfect manner and also to render same easily detachable from the bed.

For this purpose our invention consists in certain peculiar and novel features of con struction and arrangements, as hereinafter set forth.

In order that our invention may be fully understood, we will proceed to describe it with reference to the accompanying drawings.

Figure I represents a sectionalview of the zinc bed as it appears with all appliances removed. Fig. II represents a sectional view of the frame bearing the sheet-zinc, and Fig. III represents a sectional view of the zinc bed with all appliances assembled.

Similar letters refer to similar parts th roughout the several views.

Fig. I represents a sectional view of the zinc bed proper, in which A designates a cast-iron box, rectangular in shape, provided with a flange f near the top and lugs Z, conveniently placed at the bottom to suit the traveling bed of a printing-machine. The flangef is beveled off at o. Webs w are suitably placed to strengthen the structure and the spaces be tween said webs perforated with a number of very small holes h, the general arrangement of same being such as shown. Another feature of the zinc bed consists of openings 0, tube-like in shape 1, forming part of the body of the box and projecting some distance into the hollow space of the same.

Fig. II, asectional view, representsasquare frame F, fitting the top part of the box A above the flange f, preferably made of wood and beveled off at the bottom (1. Z designates a sheet-zinc provided with grooves g, which engage into the corresponding grooves g at the top of the frame F. The sheet-zinc is bent around the frame and turned into the beveled part of the frame to be fastened there. The space between the sheet-zinc and the frame has been made air-tight.

Referring to Fig. III, which is a sectional view of the zinc bed with all the parts assembled, p designates a plunger, .9 a spindle threaded, turned down at n, and which, entering a bearing 70, designed to be easily removed, will be firmly located by a collar 9". The projecting part of the spindle st is made square to receive the socket of a lever. The plunger 1) is provided with an elongated part c, which, being threaded, is designed to act like a nut for the spindle s.

1; represents an air-valve of the ordinary type as such are used in air-pumps.

The method of using this zinc bed is the following: The sheet zinc, secured to the frame in the manner described, and thus forming one piece,after being properly treated and ready to print from is placed on the top of the bed, Fig. III, and the space between the beveled-off parts d c filled then with a suitable material, such as wax, thus rendering the bed air-tight.

The application of an air-pump creating a vacuum in the hollow part of the bed, and thereby causing a pressure on the sheet-zinc, will spread same absolutely flat.

To facilitate the process of creating a vacuum, we fill the bed with a liquid. It is readily understood that a few strokes of the airpump will suffice to obtain the desired pressure, which can be modified according to wants by turning the spindles s,'which engage intothe plungers 12, thereby increasing or decreasing the hollow space of the bed, according to the direction of the motion imparted to the plungers, thus changing the pressure originally obtained.

Having now fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a zinc bed for printing purposes the combination with a detachable frame bearing the sheet-zinc and designed to render said frame air-tight to the body of the zinc bed, substantially as described.

2 esieeo 2. The combination of a frame provided to operate the plnngers, substantially as de with grooves at the top, and beveled off at the scribed. bottom, with a sheet-zinc thereon provided In testimony whereof We have set our names with grooves, said grooves engagingin grooves in the presence of two subscribing Witnesses; 5 of said frame and fastened to same substan- HENRY BURLIOH. tially as described. v

3. In a zinc bed, a cast-iron box, perforated GREGOR WALZEL A at the top and having a beveled flange, said Witnesses: box being provided with lugs, air-valves, CARL HUHN,

1o plungers, and openings to receive and means ANDREAS GOOTH. 

